[英]assigning super class a reference java
I have a class Vector with a constructor 我有一个带有构造函数的Vector类
Vector(int dimension) // creates a vector of size dimension
I have a class Neuron that extends the Vector class 我有一个类Neuron,它扩展了Vector类
public class Neuron extends Vector {
public Neuron(int dimension, ... other parameters in here ...) {
super(dimension);
// other assignments below here ...
}
}
What I want to be able to do is assign the Vector in the Neuron class a reference to another Vector. 我希望能够做的是在Neuron类中为Vector指定另一个Vector的引用。 Something along the lines of
有点像
public Neuron(Vector v, ... other parameters in here ...) {
super = v;
// other assignments below here ...
}
Of course, I can't do this. 当然,我不能这样做。 Is there some work around?
有一些工作吗? Even if I was not able to do this in the constructor of the Neuron class, that would probably be OK.
即使我无法在Neuron类的构造函数中执行此操作,也许可以。
You need to create a copy constructor in the Vector
class: 您需要在
Vector
类中创建一个复制构造函数 :
public Vector(Vector toCopy) {
this.dimension = toCopy.dimension;
// ... copy other attributes
}
and then in Neuron
you do 然后在
Neuron
你做
public Neuron(Vector v, ... other parameters in here ...) {
super(v);
// other assignments below here ...
}
You may also consider using on composition instead of inheritance . 您也可以考虑使用合成而不是继承 。 In fact, that is one of the recommendations in Effective Java.
实际上,这是Effective Java中的一个建议。 In such case you would do
在这种情况下你会这样做
class Neuron {
Vector data;
public Neuron(Vector v, ... other parameters in here ...) {
data = v;
// other assignments below here ...
}
}
Related questions: 相关问题:
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